<?php

if (!defined('BASEPATH'))
    exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package        CodeIgniter
 * @author        ExpressionEngine Dev Team
 * @copyright    Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license        http://codeigniter.com/user_guide/license.html
 * @link        http://codeigniter.com
 * @since        Version 1.0
 * @filesource
 */
// ------------------------------------------------------------------------

/**
 * Pagination Class
 *
 * @package        CodeIgniter
 * @subpackage    Libraries
 * @category    Pagination
 * @author        ExpressionEngine Dev Team
 * @link        http://codeigniter.com/user_guide/libraries/pagination.html
 */
class CI_Pagination {

    var $base_url = ''; // The page we are linking to
    var $prefix = ''; // A custom prefix added to the path.
    var $suffix = ''; // A custom suffix added to the path.
    var $total_rows = 0; // Total number of items (database results)
    var $per_page = 10; // Max number of items you want shown per page
    var $num_links = 2; // Number of "digit" links to show before/after the currently viewed page
    var $cur_page = 0; // The current page being viewed
    var $use_page_numbers = FALSE; // Use page number for segment instead of offset
    var $first_link = '&lsaquo; First';
    var $next_link = '&gt;';
    var $prev_link = '&lt;';
    var $last_link = 'Last &rsaquo;';
    var $uri_segment = 3;
    var $full_tag_open = '';
    var $full_tag_close = '';
    var $first_tag_open = '';
    var $first_tag_close = '&nbsp;';
    var $last_tag_open = '&nbsp;';
    var $last_tag_close = '';
    var $first_url = ''; // Alternative URL for the First Page.
    var $cur_tag_open = '&nbsp;<strong>';
    var $cur_tag_close = '</strong>';
    var $next_tag_open = '&nbsp;';
    var $next_tag_close = '&nbsp;';
    var $prev_tag_open = '&nbsp;';
    var $prev_tag_close = '';
    var $num_tag_open = '&nbsp;';
    var $num_tag_close = '';
    var $page_query_string = FALSE;
    var $query_string_segment = 'per_page';
    var $display_pages = TRUE;
    var $anchor_class = '';

    /**
     * Constructor
     *
     * @access    public
     * @param    array    initialization parameters
     */
    public function __construct($params = array()) {
        if (count($params) > 0) {
            $this->initialize($params);
        }

        if ($this->anchor_class != '') {
            $this->anchor_class = 'class="' . $this->anchor_class . '" ';
        }

        log_message('debug', "Pagination Class Initialized");
    }

    // --------------------------------------------------------------------

    /**
     * Initialize Preferences
     *
     * @access    public
     * @param    array    initialization parameters
     * @return    void
     */
    function initialize($params = array()) {
        if (count($params) > 0) {
            foreach ($params as $key => $val) {
                if (isset($this->$key)) {
                    $this->$key = $val;
                }
            }
        }
    }

    // --------------------------------------------------------------------

    /**
     * Generate the pagination links
     *
     * @access    public
     * @return    string
     */
    function create_links() {
        // If our item count or per-page total is zero there is no need to continue.
        if ($this->total_rows == 0 OR $this->per_page == 0) {
            return '';
        }

        // Calculate the total number of pages
        $num_pages = ceil($this->total_rows / $this->per_page);

        // Is there only one page? Hm... nothing more to do here then.
        if ($num_pages == 1) {
            return '';
        }

        // Set the base page index for starting page number
        if ($this->use_page_numbers) {
            $base_page = 1;
        } else {
            $base_page = 0;
        }

        // Determine the current page number.
        $CI = & get_instance();

        if ($CI->config->item('enable_query_strings') === TRUE OR $this->page_query_string === TRUE) {
            if ($CI->input->get($this->query_string_segment) != $base_page) {
                $this->cur_page = $CI->input->get($this->query_string_segment);

                // Prep the current page - no funny business!
                $this->cur_page = (int) $this->cur_page;
            }
        } else {
            if ($CI->uri->segment($this->uri_segment) != $base_page) {
                $this->cur_page = $CI->uri->segment($this->uri_segment);

                // Prep the current page - no funny business!
                $this->cur_page = (int) $this->cur_page;
            }
        }

        // Set current page to 1 if using page numbers instead of offset
        if ($this->use_page_numbers AND $this->cur_page == 0) {
            $this->cur_page = $base_page;
        }

        $this->num_links = (int) $this->num_links;

        if ($this->num_links < 1) {
            show_error('Your number of links must be a positive number.');
        }

        if (!is_numeric($this->cur_page)) {
            $this->cur_page = $base_page;
        }

        // Is the page number beyond the result range?
        // If so we show the last page
        if ($this->use_page_numbers) {
            if ($this->cur_page > $num_pages) {
                $this->cur_page = $num_pages;
            }
        } else {
            if ($this->cur_page > $this->total_rows) {
                $this->cur_page = ($num_pages - 1) * $this->per_page;
            }
        }

        $uri_page_number = $this->cur_page;

        if (!$this->use_page_numbers) {
            $this->cur_page = floor(($this->cur_page / $this->per_page) + 1);
        }

        // Calculate the start and end numbers. These determine
        // which number to start and end the digit links with
        $start = (($this->cur_page - $this->num_links) > 0) ? $this->cur_page - ($this->num_links - 1) : 1;
        $end = (($this->cur_page + $this->num_links) < $num_pages) ? $this->cur_page + $this->num_links : $num_pages;

        // Is pagination being used over GET or POST?  If get, add a per_page query
        // string. If post, add a trailing slash to the base URL if needed
        if ($CI->config->item('enable_query_strings') === TRUE OR $this->page_query_string === TRUE) {
            $this->base_url = rtrim($this->base_url) . '&amp;' . $this->query_string_segment . '=';
        } else {
            $this->base_url = rtrim($this->base_url, '/') . '/';
        }

        // And here we go...
        $output = '';

        // Render the "First" link
        if ($this->first_link !== FALSE AND $this->cur_page > ($this->num_links + 1)) {
            $first_url = ($this->first_url == '') ? $this->base_url : $this->first_url;
            $output .= $this->first_tag_open . '<a ' . $this->anchor_class . 'href="' . $first_url . '">' . $this->first_link . '</a>' . $this->first_tag_close;
        }

        // Render the "previous" link
        if ($this->prev_link !== FALSE AND $this->cur_page != 1) {
            if ($this->use_page_numbers) {
                $i = $uri_page_number - 1;
            } else {
                $i = $uri_page_number - $this->per_page;
            }

            if ($i == 0 && $this->first_url != '') {
                $output .= $this->prev_tag_open . '<a ' . $this->anchor_class . 'href="' . $this->first_url . '">' . $this->prev_link . '</a>' . $this->prev_tag_close;
            } else {
                $i = ($i == 0) ? '' : $this->prefix . $i . $this->suffix;
                $output .= $this->prev_tag_open . '<a ' . $this->anchor_class . 'href="' . $this->base_url . $i . '">' . $this->prev_link . '</a>' . $this->prev_tag_close;
            }
        }

        // Render the pages
        if ($this->display_pages !== FALSE) {
            // Write the digit links
            for ($loop = $start - 1; $loop <= $end; $loop++) {
                if ($this->use_page_numbers) {
                    $i = $loop;
                } else {
                    $i = ($loop * $this->per_page) - $this->per_page;
                }

                if ($i >= $base_page) {
                    if ($this->cur_page == $loop) {
                        $output .= $this->cur_tag_open . $loop . $this->cur_tag_close; // Current page
                    } else {
                        $n = ($i == $base_page) ? '' : $i;

                        if ($n == '' && $this->first_url != '') {
                            $output .= $this->num_tag_open . '<a ' . $this->anchor_class . 'href="' . $this->first_url . '">' . $loop . '</a>' . $this->num_tag_close;
                        } else {
                            $n = ($n == '') ? '' : $this->prefix . $n . $this->suffix;

                            $output .= $this->num_tag_open . '<a ' . $this->anchor_class . 'href="' . $this->base_url . $n . '">' . $loop . '</a>' . $this->num_tag_close;
                        }
                    }
                }
            }
        }

        // Render the "next" link
        if ($this->next_link !== FALSE AND $this->cur_page < $num_pages) {
            if ($this->use_page_numbers) {
                $i = $this->cur_page + 1;
            } else {
                $i = ($this->cur_page * $this->per_page);
            }

            $output .= $this->next_tag_open . '<a ' . $this->anchor_class . 'href="' . $this->base_url . $this->prefix . $i . $this->suffix . '">' . $this->next_link . '</a>' . $this->next_tag_close;
        }

        // Render the "Last" link
        if ($this->last_link !== FALSE AND ($this->cur_page + $this->num_links) < $num_pages) {
            if ($this->use_page_numbers) {
                $i = $num_pages;
            } else {
                $i = (($num_pages * $this->per_page) - $this->per_page);
            }
            $output .= $this->last_tag_open . '<a ' . $this->anchor_class . 'href="' . $this->base_url . $this->prefix . $i . $this->suffix . '">' . $this->last_link . '</a>' . $this->last_tag_close;
        }

        // Kill double slashes.  Note: Sometimes we can end up with a double slash
        // in the penultimate link so we'll kill all double slashes.
        $output = preg_replace("#([^:])//+#", "\\1/", $output);

        // Add the wrapper HTML if exists
        $output = $this->full_tag_open . $output . $this->full_tag_close;

        return $output;
    }

}

// END Pagination Class

/* End of file Pagination.php */
/* Location: ./system/libraries/Pagination.php */